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Russian Sevmash Shipyard approves a concept of modular submarine construction

According to information published by the Russian press agency TASS on September 3, 2021, Russia’s Severodvinsk-based Sevmash Shipyard, a subsidiary of the United Shipbuilding Corporation, has approved a concept of modular submarine construction.
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The modular technology for the construction of the new generation of submarines will be a method of assembling ships from large blocks loaded with equipment. (Picture source Sevmash Shipyard)

“A concept of modular submarine construction has been approved at the Sevmash Shipyard,” said the enterprise’s press department in a statement. The Sevmash Shipyard is planned to be technically refitted to the full extent in 2031.

In November 2020, Sevmash Shipyard has announced the preparation for the introduction of block-modular technology into the construction of nuclear submarines. The Sevmash shipyard is completing the previous modernization program launched in 2012. It has to develop Sevmash into a modern shipyard capable of building any vessel and comparable to American and West European counterparts at the technical level.

The implementation of the modular concept will allow the shipbuilders to save funds and boost submarine building rates, the press department added. It will provide the shipyard with the capability to distribute orders between its manufacturing capacities in an equal manner.

The modular technology for the construction of the new generation of submarines will be a method of assembling ships from large blocks loaded with equipment. It is assumed that the use of modular technology will make it possible to reduce the labor intensity and terms of building nuclear submarines.

Nowadays, a modular-modular method is used in production, which was introduced during the construction of third-generation nuclear powered ships. According to this method, the finished, but not yet tested, block sections of the future nuclear submarine are transferred from the hull-welding production to the slipway, from which blocks are formed that pass the stage of hydraulic tests. After its completion, the sections are again disconnected. This technology lengthens the construction period of the ship. When using the block-modular method, it is planned to reduce not only the slipway period, but also the costs due to the transfer of a colossal amount of work from the slipway to specialized workshops.

Sevmash now constructs Project 885/885M (NATO reporting name: Yasen/Yasen-M-class) nuclear-powered submarines with guided missiles and Project 955/955M (Borei/Borei-M-class) nuclear-powered submarines with submarine-launched ballistic missiles.